MCQ On Biomolecule Class-12 » Chemistry-Papers

Which one of the following is non-reducing sugar?

Sucrose

Maltose

Glucose

Fructose

Which is a fat soluble vitamin?

Vitamin C

Vitamin A

Vitamin B6

Which of the following statements is not correct?

In alpha-amino acids, - NH2 and – COOH groups are attached to different carbon atoms.

Natural proteins are commonly made up of L-isomer of amino acids (D) In -amino acids, - NH2 and

Except glycine, all other amino acids show optical activity

Osazone formation involves only 2 carbon atoms of glucose because of

hydrolysis

reduction

chelation

oxidation

How many amino acids (approximately) are involved during the synthesis of protein?

Guanine is an example of

a nucleotide

a nitrogenous base

a nucleoside

Which one of the following is reducing sugar?

Starch

Cellulose

Fructose

Glycogen

Vitamin A is present in-

fish liver oil

all of these

milk

butter

What will be the sequence of complimentary strand of DNA if the one strand of DNA has the sequence of TATGACTG?

ATACTGAC

ATACTGCA

ATACACTC

Deficiency of biotin causes dermatitis and paralysis, biotin is also known as

vitamin D

vitamin H

vitamin B12

Vitamin C must be supplied regularly in diet because

it is water soluble hence excreted in urine and can’t be stored in the body

it is water soluble hence used by the body on daily basis and is to be supplied regularly

it is fat soluble hence stored in the body and cannot be used on regular basis

Identify the pair of epimers

D-glucose and D-fructose

D-glucose and D-mannose

D-glucose and L-glucose

D-glucose and D-mannose

Carbohydrates have

–OH group

> C = O group

All

–CHO group

Biuret test is used for

Proteins

Sugar

Fats

Which of the following vitamins is water soluble?

Vitamin E

Vitamin D

Riboflavin

Millon’s test is given by

ester

Sucrose

Proteins

Carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone.

Polysaccharide

Monosaccharide

Oligosaccharide

Which carbohydrate is used in silvering of mirror?

(A) Sucrose

(B) Fructose

(D) B and C

D-Glucose and L-Glucose are

diastereomers

enantiomers

anomers

epimers

Deficiency of vitamin E causes

Muscular weakness

Sterility Anaemia

Scurvy

The two monosaccharide units obtained on hydrolysis of disaccharide may be

different

same

both

Select the base which is not common in DNA and RNA.

Adenine (A)

Guanine (B)

Uracil (U)

Cytosine (C)

Which of the following is the correct statement?

Starch is a polymer of α-glucose

Amylose is not a component of starch

Proteins are composed of only one type of amino acid

Reduction of hexose A (molecular formula C6H12O6) with sodium borohydride gives compound B and C. Compound B is optically inactive, whereas compound C is optically active . Which of the following is compound A?

D-mannose

D-glucose

D-fructose

D-galactose

Phosphodiester linkage is present between which carbon atoms of pentose sugars of nucleotides?

3’ and 3’

5’ and 3’

1’ and 5’

5’ and 5’

The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

glucose and fructose

fructose and sucrose

glucose and sucrose

Which of the following bases is not present in RNA?

Adenine

Thymine

Cytosine

In iodine test of starch which colour of ppt had been observed

black

blue

red

Proteins are the polymers of -amino acids and they are connected to each other by ------

coordinate bond

ionic bond

peptide bond

Glucose cannot be classified as ?

Hexose

Aldose

Carbohydrate

Oligosaccharide

Find out the correct option among the following statements.

Maltose and lactose are non-reducing sugar

Fehling’s solution and Tollen’s reagent are non-reducing sugar

All monosaccharides whether aldoses or ketoses are reducing sugar

In reducing sugars, aldehydic and ketone group are free bonded

Fehling’s solution test is given by

glucose